Question

What is the limit in miles per hour if the speed limit is 55 km/hr?

Answer 1

It would be about 34 m/h

Answer 2

To answer the question you need the conversion factor between km and mi.  Which is 1 mile = 1.60934 km. 

Then the answer is (55km/hr)(1/1.60934mi/km) = 34.18 km/hr